Goldstar FFH-8970AX Service Manual IC

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INTERNAL BLOCK DIAGRAM OF ICs

■ FAN8039BD3

5-CH Motor Diver

Description

The FAN8039BD3 is a monolithic integrated circuit suitable for a 5-CH motor driver which drives the
tracking actuator, focus actuator, sled motor, tray motor, spindle motor of the DVDP/CAR-CD systems.

28

2627

25 24 23 22

1 32 4 5 6 7

211920 18

17

16 15

8109

11

12

13 14

DO1-

DO

1+

IN1

REGVCC

REB

REO

RESX

GND1

FWD

IN2

DO 2+

DO 2-

GND2

REV

DO 5+

DO5-

DO 3-

DO 3

+

IN3

CTL

VCC1

VCC

VREF

PS

IN4

DO 4+

DO4

-

GND3

TSD

10K

10K

10K

10K

2.5V

Regulator

Level
Shift

Level
Shift

COMP

2

2

2 2

2 2

FIN

(GND)

FIN

(GND)

Level
Shift

Level
Shift

10K

10K

Level
Shift

2

2

PS

RESX

FUNCTION

H

H

H

L

L

H

L

L

All Active

Reg. Only Deactive

Reg. Only Active

All Deactive

Pin Definitions

NO Symbol Description NO Symbol Description

1DO1-CH1 Drive Output (-) 15 GND2 Power Ground1 (CH 2,3,5)

2DO1+CH1 Drive Output (+) 16 DO5+ CH5 Drive Output (+)

3IN1 CH1 Drive Input 17 DO5- CH5 Drive Output(-)

4REGVCC Regulator Supply Voltage 18 DO3- CH3 Drive Output(-)

5REB Regulator Output 19 DO3+ CH3 Drive Output (+)

6REO Regulator Feedback Input 20 IN3 CH3 Drive Input

7RESX Regulator Reset 21 VCC1 Supply Voltage1(CH2,CH3,CH5)

8GND1 Signal Ground 22 PS Power Save

9CTL CH5 Motor Speed Control 23 VREF Bias Voltage

10 FWD CH5 Forward Input 24 VCC Supply Voltage(CH1,CH4)

11 REV CH5 Reverse Input 25 IN4 CH4 Drive Input

12 IN2 CH2 Drive Input 26 DO4+ CH4 Drive Output (+)

13 DO2+ CH2 Drive Output (+) 27 DO4- CH4 Drive Output (-)

14 DO2- CH2 Drive Output (-) 28 GND3 Power Ground2 (CH 1,4)

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■ KA78R33

Low Dropout Voltage Regulator

Description

The KA78R33 is a low-dropout voltage regulator suitable for various electronic equipments. It provides
constant voltage power source with TO-220 4 lead full mold package. Dropout voltage of KA78R33 is
below 0.5V in full rated current(1A). This regulator has various function such as peak current protection,
thermal shut down, overvoltage protection and output disable function.

Internal Block Diagram

THERMAL SHUTDOWN

BANDGAP REFERENCE

OVERVOLTAGE
PROTECTION

SOA PROTECTION

SHORTCIRCUIT
PROTECTION

1

4

3

2

Vin

Vdis

Vo

GND

HIGH / LOW

OUTPUT
ON / OFF

Q1

R1

R2

-

+

­+

1.4V

-

CIRCUIT

■ LC72131

AM/FM PLL Frequency Synthesizer

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B01 B02 B03 B04 I01 I02

XIN

PD

AIN

AOUT

IFIN

XOUT

FMIN

AMIN

CE

DI

CL

D0

VDD

VSS

REFERENCE
DIVIDER

PHASE DETECTOR
CHARGE PUMP

UNLOCK
DETECTOR

UNIVERSAL
COUNTER

DATA SHIFT REGISTER

LATCH

12bits PROGRAMMABLE

DIVIDER

SWALLOW COUNTER

1/16. 1/17 4bits

POWER

ON

RESET

CCB

I/F

1

2

Block Diagram

■ LA1837

Single-Chip Home stereo IC with Electronic Tuning Support

The LA1837 is a single-chip AM/FM IF and MPX IC that supports electronic tuning and was developed for
use in home stereo systems. It is optimal for use in automatic station selection systems that use the SD and
IF counting techniques.

Block Diagram

FM SD

ADJ

3 rd 5 th

DECODER

ANTI-BIRDIE

FM

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■ KIA 78R12 PI

4 TERMINAL LOW DROP VOLTAGE REGULATOR

The KIA78RXX Series are Low Drop Voltage Regulator suitable for various electronic equipments. It
provides constant voltage power source with TO-220 4 termainal lead full molded PKG. The Regulator has
multi function such as over current protection, overheat protection and ON/OFF control.

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■ KIA7805AP/API

THREE TERMINAL POSITIVE VOLTAGE REGULATORS 5V, 6V, 8V, 9V, 10V, 12, 15V, 18V, 24V.

EQUIVALENT CIRCUIT

Block Diagram

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■ BA3126N

2-channel head switch for radio cassette recorders

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Control circuit

12-bit shift register

Latch

Output buffer

(open drain)

1Vss
2DATA
3CLOCK
4Q0
5Q1

6 Q2

7Q3
8Q4

16 VDD
15 Q11
14 Q10
13 Q9
12 Q8
11 Q7
10 Q6

9 Q5

Pin No.

Pin name Function

BU2090/F/FS BU2092/F BU2092/FV

111Vss GND
222DATA Serial data input
333CLOCK Data shift clock input

-44LCK Data latch clock input
455Q0parallel data output
566Q1parallel data output
677Q2parallel data output
788Q3parallel data output
899Q4parallel data output
91010Q5parallel data output

10 11 11 Q6 parallel data output

--12 N.C. Not connected

--13 N.C. Not connected

11 12 14 Q7 parallel data output
12 13 15 Q8 parallel data output
13 14 16 Q9 parallel data output
14 15 17 Q10 parallel data output
15 16 18 Q11 parallel data output

-1719OEOutput Enable

16 18 20 V

DD Power supply

PIN DESCRIPTION

■ BU2090F

12-bit, Serial IN, Parallel OUT driver

Block diagram

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REPAIRS REGARDING CD MECHANISM

IMPROVED METHOD - WHEN THE TRAY GEARS WERE DISTORTED

1. How to open the tray.
In case of not suppling power push two hooks (H) of the base, and them open the tray.

2. How to improve the distorted gears.
(1) Do the hole "C" of the cam gear to face forward the pick-up so the pick-up is down like figure.
(2) Do the hole "B" of main gear to face forward pick-up, too.
(3) Set the last part of main gear to point "A".
(4) Push the tray to end.